H
hardware
system
area
(HSA).
A
logical
area
of
central
storage,
not
addressable
by
application
programs,
used
to
store
Licensed
Internal
Code
and
control
information.
hex.
Hexadecimal.
hexadecimal.
(1)
Pertaining
to
a
selection,
choice,
or
condition
that
has
16
possible
values
or
states.
(I)
(2)
Pertaining
to
a
fixed-radix
numeration
system,
with
radix
of
16.
(I)
(3)
Pertaining
to
a
numbering
system
with
base
of
16;
valid
numbers
use
the
digits
0–9
and
characters
A–F,
where
A
represents
10
and
F
represents
15.
HSA.
Hardware
system
area.
I
I/O.
Input/output.
ICF.
Internal
coupling
facility.
ICP.
Internal
coupling
facility
peer
channel.
ID.
Identifier.
identifier
(ID).
(1)
One
or
more
characters
used
to
identify
or
name
a
data
element
and
possibly
to
indicate
certain
properties
of
that
data
element.
(T)
(2)
A
sequence
of
bits
or
characters
that
identifies
a
program,
device,
or
system
to
another
program,
device,
or
system.
(3)
In
an
ESCON
Director,
a
user-defined
symbolic
name
of
24
characters
or
fewer
that
identifies
a
particular
ESCD.
IFL.
Integrated
Facility
for
Linux.
IFA.
Integrated
Facility
for
Applications.
Also
referred
to
as
zAAPs,
or
System
z9
Application
Assist
Processors.
IML.
Initial
machine
load.
IMS.
Information
Management
System.
initial
program
load
(IML).
A
procedure
that
prepares
a
device
for
use.
initial
program
load
(IPL).
(1)
The
initialization
procedure
that
causes
an
operating
system
to
commence
operation.
(2)
The
process
by
which
a
configuration
image
is
loaded
into
storage
at
the
beginning
of
a
work
day
or
after
a
system
malfunction.
(3)
The
process
of
loading
system
programs
and
preparing
a
system
to
run
jobs.
initialization.
(1)
The
operations
required
for
setting
a
device
to
a
starting
state,
before
the
use
of
a
data
medium,
or
before
implementation
of
a
process.
(T)
(2)
Preparation
of
a
system,
device,
or
program
for
operation.
(3)
To
set
counters,
switches,
addresses,
latches,
or
storage
contents
to
zero
or
to
other
starting
values
at
the
beginning
of,
or
at
the
prescribed
points
in,
a
computer
program
or
process.
input/output
(I/O).
(1)
Pertaining
to
a
device
whose
parts
can
perform
an
input
process
and
an
output
process
at
the
same
time.
(I)
(2)
Pertaining
to
a
functional
unit
or
channel
involved
in
an
input
process,
output
process,
or
both,
concurrently
or
not,
and
to
the
data
involved
in
such
a
process.
(3)
Pertaining
to
input,
output,
or
both.
input/output
configuration.
The
collection
of
channel
paths,
control
units,
and
I/O
devices
that
attaches
to
the
processor.
input/output
configuration
data
set
(IOCDS).
The
data
set
that
contains
an
I/O
configuration
definition
built
by
the
I/O
configuration
program
(IOCP).
input/output
configuration
program
(IOCP).
A
program
that
defines
to
a
system
all
the
available
I/O
devices
and
the
channel
paths.
interactive.
Pertaining
to
a
program
or
system
that
alternately
accepts
input
and
then
responds.
An
interactive
system
is
conversational;
that
is,
a
continuous
dialog
exists
between
the
user
and
the
system.
Contrast
with
batch
.
interface.
(1)
A
shared
boundary
between
two
functional
units,
defined
by
functional
characteristics,
signal
characteristics,
or
other
characteristics
as
appropriate.
The
concept
includes
the
specification
of
the
connection
of
two
devices
having
different
functions.
(T)
(2)
Hardware,
software,
or
both,
that
links
systems,
programs,
or
devices.
interrupt.
(1)
A
suspension
of
a
process,
such
as
execution
of
a
computer
program
caused
by
an
external
event,
and
performed
in
such
a
way
that
the
process
can
be
resumed.
(A)
(2)
To
stop
a
process
in
such
a
way
that
it
can
be
resumed.
(3)
In
data
communication,
to
take
an
action
at
a
receiving
station
that
causes
the
sending
station
to
end
a
transmission.
(4)
To
temporarily
stop
a
process.
interruption.
Synonym
for
interrupt
.
IOCDS.
I/O
configuration
data
set.
IOCP.
I/O
configuration
program.
IOP.
Input/Output
processor.
IPL.
Initial
program
load.
IRD.
Intelligent
Resource
Director.
ITR.
Internal
throughput
rate.
Glossary
D-5
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